Variability of Millennial‐Scale Trends in the Geomagnetic Axial Dipole
Variability of Millennial‐Scale Trends in the Geomagnetic Axial Dipole
复制标题
地磁轴偶极子千禧年尺度趋势的变化
DOI:
10.1029/2019gl085909
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发表时间:
2019
影响因子:
5.2
通讯作者:
Avery, M. S.
中科院分区:
文献类型:
--
作者:
Buffett, B.;Davis, W.;Avery, M. S.
The historical trend in the axial dipole is sufficient to reverse the field in less than 2 kyr. Assessing the prospect of an imminent polarity reversal depends on the probability of sustaining the historical trend for long enough to produce a reversal. We use a stochastic model to predict the variability of trends for arbitrary time windows. Our predictions agree well with the trends computed from paleomagnetic models. Applying these predictions to the historical record shows that the current trend is likely due to natural variability. Furthermore, an extrapolation of the current trend for the next 1 to 2 kyr is highly unlikely. Instead, we compute the trend and time window needed to reverse the field with a specified probability. We find that the dipole could reverse in the next 20 kyr with a probability of 2%.
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